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        .session_expiry_interval = 10,
        .maximum_packet_size = 1024,
        .receive_maximum = 65535,
        .topic_alias_maximum = 2,
        .request_resp_info = true,
        .request_problem_info = true,
        .will_delay_interval = 10,
        
        .payload_format_indicator = true,
        .message_expiry_interval = 10,
        .response_topic = "/test/response",
        .correlation_data = "123456",
        .correlation_data_len = 6,
    };

    esp_mqtt_client_config_t mqtt5_cfg = {
        .broker.address.uri = CONFIG_BROKER_URL,
        .session.protocol_ver = MQTT_PROTOCOL_V_5,
        .network.disable_auto_reconnect = true,
        .credentials.username = "123",
        .credentials.authentication.password = "456",
        .session.last_will.topic = "/topic/will",
        .session.last_will.msg = "i will leave",
        .session.last_will.msg_len = 12,
        .session.last_will.qos = 1,
        .session.last_will.retain = false,
    };